| a |
| 3 |
| b |
| 4 |
| c |
| 5 |
| 2a+3b-c |
| 3a-2b+3c |
| a |
| 3 |
| b |
| 4 |
| c |
| 5 |
| 2a+3b-c |
| 3a-2b+3c |
| 6k+12k-5k |
| 9k-8k+15k |
| 13 |
| 16 |
| 13 |
| 16 |
| 1 |
| 2 |
| 5 |
| 8 |
| m-n |
| m2-2mn+n2 |
| mn+n2 |
| m2-n2 |
| mn |
| n-1 |
| x2+1 |
| x2-1 |
| x-2 |
| x-1 |
| x-2 |
| x |
| -a |
| b |
| 2a2 |
| 5b |
| a |
| 5b |
| x+2 |
| x2-2x |
| x-1 |
| x2-4x+4 |
| x-4 |
| x |
| 2x |
| x+1 |
| x2-2x+1 |
| x2-1 |
| 1 |
| x |
| 1 |
| x2+x |
| a |
| a-1 |
| a2-a |
| a2-1 |
| 1 |
| a-1 |
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